:root {
    --primary-color: #0d1a2e;
    --secondary-color: #1a3a8f;
    --accent-color: #ff6b35;
    --text-color: #e0e0e0;
    --light-accent: #29b6f6;
    --dark-accent: #8e24aa;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-color);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    padding: 0;
    margin: 0;
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
  }

  .header {
    text-align: center;
    padding: 40px 0;
    position: relative;
    overflow: hidden;
  }

  .header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(41, 182, 246, 0.1) 0%, transparent 70%);
    z-index: -1;
  }

  .header h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--light-accent), var(--dark-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 10px rgba(41, 182, 246, 0.3);
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 15px;
    margin: 20px 0;
    border-radius: 0 5px 5px 0;
    font-size: 0.9rem;
  }

  article {
    background: rgba(13, 26, 46, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin: 30px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
  }

  article::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(138, 43, 226, 0.1) 0%, transparent 70%);
    z-index: -1;
  }

  h2 {
    font-size: 1.8rem;
    margin: 25px 0 15px;
    color: var(--light-accent);
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--light-accent), transparent);
  }

  h3 {
    font-size: 1.4rem;
    margin: 20px 0 10px;
    color: var(--dark-accent);
  }

  p {
    margin-bottom: 15px;
    font-size: 1.05rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .image-card {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

  .image-card:hover img {
    transform: scale(1.05);
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
    border-left: 4px solid var(--accent-color);
  }

  pre::before {
    content: "CSS";
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent-color);
    color: white;
    padding: 2px 10px;
    font-size: 0.8rem;
    border-radius: 0 0 0 5px;
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 30px 0;
  }

  .nav-link {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
    overflow: hidden;
  }

  .nav-link::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
  }

  .nav-link:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--light-accent);
  }

  .nav-link:hover::before {
    transform: translateX(100%);
  }

  .footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }
    
    .header p {
      font-size: 1rem;
    }
    
    article {
      padding: 20px;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    h3 {
      font-size: 1.2rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Particle animation */
  .particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
  }

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: particleFall linear infinite;
  }

  @keyframes particleFall {
    0% {
      transform: translateY(-100vh) translateX(0);
      opacity: 0;
    }
    10% {
      opacity: 1;
    }
    90% {
      opacity: 1;
    }
    100% {
      transform: translateY(100vh) translateX(100px);
      opacity: 0;
    }
  }

  /* Floating elements */
  .floating {
    animation: floating 3s ease-in-out infinite;
  }

  @keyframes floating {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }